sgffpSnapGene File Format Parser

Read, write, and manipulate SnapGene .dna files in Python

Full-Fidelity Parsing

Reverse-engineered parser handles all 15 block types — DNA, compressed DNA, features, primers, history, traces, and more.

Typed Python Models

Access sequence, features, primers, notes, and history through clean, documented Python objects with lazy loading and automatic sync.

Builder & Ops API

Create files from scratch with a chainable builder, or record cloning operations with the Ops API that maintains a full SnapGene-compatible history tree.